package com.hmdp.config;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.UserHolder;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.TimeUnit;

/**
 * @author XPQ
 * @date 2024/5/28
 */

public class RefreshTokenInterceptor implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 获取请求头中的token
        String token = request.getHeader("authorization");
        if (StrUtil.isEmpty(token)) {
            return true;
        }
        // 从redis中获取用户信息
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(RedisConstants.LOGIN_USER_KEY + token);
        UserDTO user = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        // 判断用户是否存在
        if (Objects.isNull(user)) {
            // 不存在放行，交给下一个拦截器
            return true;
        }
        // 存在，保存用户信息到threadLocal中
        UserHolder.saveUser(user);
        // 刷新token有效期
        stringRedisTemplate.expire(RedisConstants.LOGIN_USER_KEY + token, RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        UserHolder.removeUser();
    }
}
